[Bug 1247860] [NEW] Trusty lxc smoke tests hang with lucid lxc-execute

[Parameswaran Sivatharman]

Public bug reported:

Trusty smoke lxc tests appear to hang starting from 20131102 (coincides
with the new trusty kernel Linux version 3.12.0-1-generic) . The issue
occurs on both amd64 and i386 images. When this occurs the vm where the
lxc containers get created becomes unresponsive when this happens.

Steps to reproduce:
1. Install a default saucy server on a vm (either manually or preseeded default installation) with either i386 or amd64 image using KVM, libvirt
2. Do the following to install utah inside the VM
   sudo apt-add-repository -y ppa:utah/stable
   sudo apt-get update
   sudo apt-get install utah

3. Run the lxc tests using
     sudo utah -r lp:ubuntu-test-cases/server/runlists/lxc.run

Looks like the test_lxc_simple test is the one that's causing the hang
and soon after http://bazaar.launchpad.net/~ubuntu-server-dev/ubuntu-
test-cases/server-tests-
raring/view/head:/testsuites/lxc/test_lxc_simple/lxctest.py#L193


Note:
I tried to reproduce this using a saucy vm host and the tests are not hanging there. The jenkins jobs in smoke tests are using a precise VM host. 

The impacted smoke tests are:
https://jenkins.qa.ubuntu.com/view/Trusty/view/Smoke%20Testing/job/trusty-server-amd64-smoke-lxc/5/
and
https://jenkins.qa.ubuntu.com/view/Trusty/view/Smoke%20Testing/job/trusty-server-i386-smoke-lxc/5/

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: lxc 1.0.0~alpha2-0ubuntu5
ProcVersionSignature: Ubuntu 3.12.0-1.3-generic 3.12.0-rc7
Uname: Linux 3.12.0-1-generic x86_64
ApportVersion: 2.12.6-0ubuntu1
Architecture: amd64
Date: Mon Nov  4 09:00:26 2013
InstallationDate: Installed on 2013-11-04 (0 days ago)
InstallationMedia: Ubuntu-Server 14.04 LTS "Trusty Tahr" - Alpha amd64 (20131104)
MarkForUpload: True
SourcePackage: lxc
UpgradeStatus: No upgrade log present (probably fresh install)
defaults.conf:
 lxc.network.type = veth
 lxc.network.link = lxcbr0
 lxc.network.flags = up

** Affects: lxc (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug iso-testing trusty

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https://bugs.launchpad.net/bugs/1247860

Title:
  Trusty lxc smoke tests hang with lucid lxc-execute

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